<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script src="./axios.js"></script>
  <script>
    axios.defaults.baseURL = 'http://www.itcbc.com:3006'

    // axios这个函数，和自己封装的函数 差不多。调用 axios 函数，会得到 Promise对象
    let p1 = axios.get('/api/province')
    let p2 = axios.get('/api/city', { params: { xxx: '河北省' } })
    let p3 = axios.get('/api/county', { params: { pname: '河北省', cname: '承德市' } })

    // 前一个then，返回Promise对象；对象的结果会被下一个then得到
    // p1.then(result => {
    //   console.log(result.data)
    //   return p2
    // }).then(result => {
    //   console.log(result.data)
    //   return p3
    // }).then(result => {
    //   console.log(result.data)
    // }).catch(error => {
    //   // console.dir(error)
    //   console.log(error.response.data.message)
    // })

    async function abc() {
      try {
        let res1 = await p1
        console.log(res1.data)
        let res2 = await p2
        console.log(res2.data)
        let res3 = await p3
        console.log(res3.data)
      } catch (e) {
        // console.log(e)
        // console.dir(e)
        console.log(e.response.data.message)
      }
    }
    abc()
  </script>
</body>

</html>